Description
Key Technical Specifications
| Parameter | Detail |
|---|---|
| Part Number | A4H254-8F8T |
| Alternate SKU | P0973JP |
| Manufacturer | Enterasys (Extreme Networks) |
| Product Family | Enterasys A4 Series |
| Fixed Copper Ports | 8× 10/100/1000BASE-T (RJ-45) |
| Uplink Ports | 8× 100/1000 Mbps SFP (mini-GBIC) |
| Switching Capacity | ~17.6 Gbps per unit (A4 family spec) |
| Forwarding Rate | Up to 104.8 Mpps stack capacity (family-level figure) |
| MAC Address Table | Up to 16,000 entries (A4 family) |
| Stacking | Up to 8 units in a stack; closed-loop stacking supported |
| L2 Features | VLAN, 802.1Q, STP/RSTP, link aggregation (LAG), port mirroring |
| L3 Features | Basic static routing / policy-based routing (A4 family capability) |
| QoS | 802.1p/DSCP classification, priority queuing, VoIP auto-provisioning |
| Security | ACL, 802.1X, port security, RADIUS/TACACS+ |
| Management | CLI, Web (WebView), SNMP |
| Power | Internal AC power; optional external redundant power supply |
| Mounting | 19-inch rack-mountable or desktop |
| Condition | Surplus / refurbished (verify with supplier) |
Product Introduction
The Enterasys A4H254-8F8T (also referenced as P0973JP) is a stackable managed edge switch from the Enterasys A4 Series, designed for enterprise access and aggregation deployments where a mix of copper endpoint connections and fiber uplinks is required.
It provides 8× 10/100/1000BASE-T RJ-45 ports for connecting PCs, IP phones, printers, and other endpoint devices, plus 8× SFP slots for fiber uplinks or high-speed inter-switch links. This hybrid port layout makes it well suited for wiring-closet deployments where fiber backbone connectivity is needed but copper endpoint density remains the primary requirement.
The switch supports full L2 managed features — VLAN segmentation, STP/RSTP, link aggregation, and port mirroring — along with basic L3 capabilities and policy-based routing inherited from the A4 family platform. QoS features include 802.1p/DSCP classification and priority queuing, with VoIP auto-provisioning support for simplified IP phone deployment. Security is handled through ACLs, 802.1X port authentication, and port security policies.
Stacking is a key feature: up to eight A4 switches can be interconnected to form a single logical switch, managed under one IP address with closed-loop redundancy to maintain connectivity even if one stack member or interconnect fails. Management is available via CLI, Web interface (WebView), and SNMP.
From a lifecycle standpoint, the A4 Series is a legacy product line. Enterasys was acquired by Extreme Networks, and the A4 platform has since been succeeded by newer Extreme switching families. The A4H254-8F8T is now primarily encountered as a replacement spare or in environments where existing stacks are still in service.
Enterasys A4H254-8F8T
QA/QC Transparency SOP
- Intake & Origin Verification — Confirm model A4H254-8F8T and alternate SKU P0973JP. Inspect the chassis for physical damage, bent rack ears, damaged SFP cages, and corroded RJ-45 contacts. Verify serial number and firmware version.
- Power-Up & POST Test — Apply AC power. Verify POST completion, fan operation, and LED status. Confirm the switch boots to a usable CLI/Web interface without error codes.
- Port Verification — Test all 8× RJ-45 ports at 10/100/1000 Mbps using a cable tester or link partner. Test all 8× SFP slots with known-good SFP transceivers. Verify link establishment and error-free frame forwarding.
- Functional Testing — Create test VLANs, configure a LAG, and verify ACL enforcement. Test SNMP polling and Web management access. Verify stacking capability if multiple units are available.
- Final QC & Packaging — Reset to factory defaults unless a specific configuration is requested. Seal in anti-static packaging with desiccant. Include test report with serial number, firmware version, port test results, and photo documentation.
Field Engineer Gotchas
- Legacy platform. The A4 Series is end-of-life. Firmware updates, SFP compatibility lists, and technical support may be limited. Verify Extreme Networks support status before deploying in a new installation.
- SFP compatibility is not universal. The A4H254-8F8T may require Enterasys/Extreme-coded SFPs. Third-party SFPs might not be recognized without compatible firmware or coding.
- Stacking cabling matters. Closed-loop stacking requires correct interconnect cables and proper topology. A broken ring degrades redundancy — verify stack health after any maintenance.
- No universal PoE guarantee. Some A4 models support 802.3af PoE, but the A4H254-8F8T’s PoE capability is not confirmed across all sources. Do not assume PoE — verify against the specific unit’s label and datasheet before connecting PoE devices.
- Redundant power is optional. The internal PSU is the primary power source. External redundant power supplies are optional add-ons. For critical deployments, confirm whether the site has redundant power installed.
- Factory reset before redeployment. Surplus units may retain previous VLAN, ACL, and SNMP configurations. Always perform a factory reset and verify firmware version before putting the switch into production.
Enterasys A4H254-8F8T
Application Scenarios
- Wiring closet access switch. An office floor uses the to connect desktop PCs and IP phones via the 8× copper ports, with SFP uplinks providing fiber connectivity back to the distribution layer.
- Stacked access layer. Four units are stacked to provide 32 copper ports and 32 SFP uplinks under a single management IP, simplifying VLAN provisioning and reducing management overhead.
- Legacy network maintenance. A campus network still running A4 Series switches requires a like-for-like replacement after a unit failure. The is sourced as a refurbished spare, and the existing stack configuration is restored without re-engineering.
- Small server room aggregation. The 8× SFP ports are used to aggregate fiber connections from remote IDFs, while the copper ports handle local management stations and out-of-band management interfaces.
FAQ
A: P0973JP is an alternate SKU/ordering number for the same switch. They refer to the same hardware platform.
Q: Does it support PoE?
A: Some A4 Series models support 802.3af PoE, but PoE capability for the specifically is not confirmed across all sources. Verify against the unit label and official datasheet before assuming PoE support.
Q: How many units can be stacked?
A: Up to 8 A4 switches can be stacked into a single logical switch with closed-loop redundancy.
Q: What management interfaces are available?
A: CLI, Web (WebView), and SNMP are supported.
Q: Is this switch still supported by the vendor?
A: The A4 Series is a legacy product line under Extreme Networks (which acquired Enterasys). Official support availability should be confirmed directly with Extreme Networks or an authorized partner.
Q: Can I use third-party SFPs?
A: Possibly, but Enterasys/Extreme switches often require coded SFPs. Third-party SFPs may need compatible coding or firmware support. Test before deployment.
Q: What is the switching capacity?
A: The A4 family is rated at approximately 17.6 Gbps per unit, with stack capacity up to 140.8 Gbps for 8 units. Confirm the exact per-unit figure for the against the official datasheet.
